Positron annihilation study of the electronic structure of LaB{sub 6} and CeB{sub 6}

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.10192· OSTI ID:543825

Biasini, M; Fretwell, H M; Dugdale, S B; Alam, M A ^[1]; Kubo, Y ^[2]; Harima, H ^[3]; Sato, N ^[4]

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1. H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom)
2. Department of Physics, College of Humanities and Sciences, Nihon University, Tokyo 156 (Japan)
3. CIAS, University of Osaka Prefecture, Sakai, Osaka 593 (Japan)
4. Department of Physics, Tohoku University, Aramaki Aoba, Sendai 980-77 (Japan)

We measured the two-dimensional angular correlation of the positron annihilation radiation (2D-ACAR) on a single crystal of LaB{sub 6} for two projections. The anisotropies of the 2D electron-positron momentum density were very similar to those observed for the isostructural heavy-fermion (HF) system CeB{sub 6} in the paramagnetic phase and consistent with those of the calculated electron-positron momentum density of LaB{sub 6}. The standard Lock-Crisp-West (LCW) analysis was in reasonable agreement with the LCW folding of the calculated 2D-ACAR spectrum and the de Haas{endash}van Alphen findings. From the projected {bold {ital k}}-space density we could evaluate the Fermi volume, corresponding to 1.10{plus_minus}0.04 electrons per formula unit, and deduce that the effect of the nonuniform positron density does not play a significant role. The apparent discrepancy with the LCW analysis of CeB{sub 6}, where filtering procedures were required to recover a k-space density similar to that obtained for LaB{sub 6}, is discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 543825
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 16 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANGULAR CORRELATION
ANISOTROPY
ANNIHILATION
CERIUM BORIDES
CERIUM COMPOUNDS
DE HAAS-VAN ALPHEN EFFECT
ELECTRON-POSITRON INTERACTIONS
ELECTRONIC STRUCTURE
LANTHANUM BORIDES
LANTHANUM COMPOUNDS
MONOCRYSTALS